Journal ArticleDOI
Effect of Geometric Configurations on the Starting Transients in Vacuum Ejector
R. Arun Kumar,G. Rajesh +1 more
TLDR
In this article, the starting transients in vacuum ejector and its dependence on various geometric configurations were investigated, and various geometric parameters were the ratio of diffuser to priors were investigated.Abstract:
This paper investigates the starting transients in vacuum ejector and its dependence on various geometric configurations. Various geometric parameters investigated were the ratio of diffuser to pri...read more
Citations
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Journal ArticleDOI
Starting transients in second throat vacuum ejectors for high altitude testing facilities
Ghanshyam Bharate,Arun Kumar R +1 more
TL;DR: In this article, the authors investigated the process of vacuum generation in a second throat vacuum ejector system employed for the high altitude testing of rocket motors and found that the various stages of evacuation are closely linked to the internal shock wave movement in the supersonic nozzle.
Journal ArticleDOI
Transient characteristics of a typical vacuum ejector—An experimental study
TL;DR: In this article , the authors investigate the characteristics of a typical vacuum ejector's starting transient, steady-state, and shut-down transient, using time-resolved Schlieren images and oil flow visualization.
Journal ArticleDOI
Starting transient analysis of second throat exhaust diffuser in high-altitude test of a thrust optimized parabolic nozzle
TL;DR: In this paper , the authors present a combined numerical and experimental investigation of the starting process of a second throat diffuser during ground testing of a thrust-optimized parabolic (TOP).
References
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ReportDOI
The effect of second throat geometry on the performance of ejectors without induced flow
R C Bauer,R C German +1 more
TL;DR: In this article, an investigation of ejectors without induced flow was made to determine the effects of second throat geometry and position on the starting and operating pressure ratios of the ejector.
Journal ArticleDOI
Studies on the starting transient of a straight cylindrical supersonic exhaust diffuser: Effects of diffuser length and pre-evacuation state
TL;DR: In this paper, the effects of essential performance parameters on the starting transient of a straight cylindrical supersonic exhaust diffuser (SED) are numerically investigated in terms of SED length and pre-evacuation configuration.
Journal ArticleDOI
Physics of vacuum generation in zero-secondary flow ejectors
R. Arun Kumar,G. Rajesh +1 more
TL;DR: In this article, the authors investigate the secondary flow characteristics and the associated vacuum generation caused with an increase in the primary pressure ramping in zero-secondary flow ejectors, and they find that with the jet expansion reaching a critical level, the fluid supply from the reverse flow is suddenly entrained back into the main jet at the maximum jet expansion point.
Journal ArticleDOI
Optimization of Second Throat Ejectors for High-Altitude Test Facility
R. Manikanda Kumaran,P. K. Vivekanand,Thirumalachari Sundararajan,K. Kumaresan,D. Raja Manohar +4 more
TL;DR: In this article, a second throat ejector using nitrogen as the primary fluid is considered for the creation of a low vacuum in a high-altitude testing facility for large-area-ratio rocket motors.
ReportDOI
Effects of diffuser length on the performance of ejectors without induced flow
R. C. German,R. C. Bauer +1 more
TL;DR: In this paper, an investigation of ejectors without induced flow was made to determine the effects of varying diffuser lengths on ejector performance, and an empirical method was developed to estimate the starting and operating pressure ratios of such ejector configurations using simple-determined one-dimensional normal shock relationships.